Planex MZK-NAS01SG no more working after FW update, still live in telnet ethernet connection (recovery?)

Hello to everybody. I'm in trouble with my Planex (PCi) MZK-NAS01SG.

I did the FW update to the latest 1.4.2 from the Planex WebGUI, it seemed to finish fine...but after rebooting the device, no more WebGUI was available for viewing NAS and also to manage it, for example to reflash again firmware (bricked??).

Now, I'm able to connect the NAS in ethernet (its IP is now 192.168.1.254), and the ping response is Ok.
I can start a telnet session from windows (Win7 x64) telnet 192.168.1.254 at port 1192.
login as root with password: password when requested, and I'm at the command prompt #.
I can browse directories, type commands, and look to the files on the HDD (DataFolder), where i put the images-1.3.6.bin file (latest working fine).
But I cannot use it anymore.

My linux knowledge is very poor. Is there a way to recover my Planex MZK-NAS01SG from the busybox console, before open the box and try the serial connection procedure explained?

The NAS box is worthy of recovering as there is nothing wrong with it from a hardware point of view.

Since the bootloader seems to be working fine, then a connection to the serial port should work and give you access to the bootloader menu. From there you can reload the planex firmware as described in the WIKI's here or maybe try the OPENWRT (opensource) firmware.

Just means opening the box and a do a little bit of hardware tinkering.

I've not had any need to do this myself so I am just going by the information from others.

The guys here are always willing to help if you get into difficulty doing these kinds of things.